Lewis Acids and Bases

Lewis acids are electron pair acceptors; Lewis bases are electron pair donors. There is no single quantitative measure of Lewis acidity/basicity like there is in Brønsted theory.

Lewis Acids:

H+: Bare Proton
BF3: Structure and explanation
AlCl3: Structure and explanation
tert-Butyl Cation: Structure and explanation
FeCl3: Structure and explanation
SnCl4: Structure and explanation

Lewis Bases:

Br-: Structure and explanation
Ammonia: Structure and explanation
Water: Structure and explanation

Organic compounds

with both characters:
Acetone: Structure and explanation
Acetonitrile: Structure and explanation
Chlorobutane: Structure and explanation